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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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4 -- --
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5 -- S Y S T E M . O S _ I N T E R F A C E --
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6 -- --
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7 -- S p e c --
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8 -- --
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9 -- Copyright (C) 1991-1994, Florida State University --
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145
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10 -- Copyright (C) 1995-2019, Free Software Foundation, Inc. --
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111
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11 -- --
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12 -- GNAT is free software; you can redistribute it and/or modify it under --
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13 -- terms of the GNU General Public License as published by the Free Soft- --
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14 -- ware Foundation; either version 3, or (at your option) any later ver- --
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15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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17 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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18 -- --
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19 -- As a special exception under Section 7 of GPL version 3, you are granted --
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20 -- additional permissions described in the GCC Runtime Library Exception, --
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21 -- version 3.1, as published by the Free Software Foundation. --
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22 -- --
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23 -- You should have received a copy of the GNU General Public License and --
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24 -- a copy of the GCC Runtime Library Exception along with this program; --
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25 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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26 -- <http://www.gnu.org/licenses/>. --
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27 -- --
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28 -- GNARL was developed by the GNARL team at Florida State University. --
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29 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
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30 -- --
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31 ------------------------------------------------------------------------------
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32
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33 -- This is a LynxOS-178 Elf (POSIX-8 Threads) version of this package
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34
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35 -- This package encapsulates all direct interfaces to OS services that are
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36 -- needed by the tasking run-time (libgnarl).
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37
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38 -- PLEASE DO NOT add any with-clauses to this package or remove the pragma
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39 -- Preelaborate. This package is designed to be a bottom-level (leaf) package.
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40
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41 with Ada.Unchecked_Conversion;
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42
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43 with Interfaces.C;
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44
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45 with System.Multiprocessors;
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46
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47 package System.OS_Interface is
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48 pragma Preelaborate;
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49
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50 pragma Linker_Options ("-mthreads");
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51 -- Selects the POSIX 1.c runtime, rather than the non-threading runtime or
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52 -- the deprecated legacy threads library.
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53
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54 subtype int is Interfaces.C.int;
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55 subtype short is Interfaces.C.short;
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56 subtype long is Interfaces.C.long;
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57 subtype unsigned is Interfaces.C.unsigned;
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58 subtype unsigned_short is Interfaces.C.unsigned_short;
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59 subtype unsigned_long is Interfaces.C.unsigned_long;
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60 subtype unsigned_char is Interfaces.C.unsigned_char;
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61 subtype plain_char is Interfaces.C.plain_char;
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62 subtype size_t is Interfaces.C.size_t;
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63 subtype int64 is Interfaces.Integer_64;
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64
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65 -----------
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66 -- Errno --
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67 -----------
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68
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69 function errno return int;
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70 pragma Import (C, errno, "__get_errno");
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71
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72 EAGAIN : constant := 11;
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73 EINTR : constant := 4;
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74 EINVAL : constant := 22;
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75 ENOMEM : constant := 12;
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76 ETIMEDOUT : constant := 60;
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77 -- Error codes
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78
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79 -------------
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80 -- Signals --
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81 -------------
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82
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83 Max_Interrupt : constant := 63;
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84 -- Max_Interrupt is the number of OS signals, as defined in:
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85 --
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86 -- /usr/include/sys/signal.h
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87 --
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88 -- The lowest numbered signal is 1, but 0 is a valid argument to some
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89 -- library functions, e.g. kill(2). However, 0 is not just another signal:
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90 -- For instance 'I in Signal' and similar should be used with caution.
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91
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92 type Signal is new int range 0 .. Max_Interrupt;
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93 for Signal'Size use int'Size;
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94
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95 SIGHUP : constant := 1; -- hangup
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96 SIGINT : constant := 2; -- interrupt (rubout)
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97 SIGQUIT : constant := 3; -- quit (ASCD FS)
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98 SIGILL : constant := 4; -- illegal instruction (not reset)
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99 SIGTRAP : constant := 5; -- trace trap (not reset)
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100 SIGBRK : constant := 6; -- break
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101 SIGIOT : constant := 6; -- IOT instruction
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102 SIGABRT : constant := 6; -- used by abort, replace SIGIOT in future
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103 SIGCORE : constant := 7; -- kill with core dump
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104 SIGEMT : constant := 7; -- EMT instruction
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105 SIGFPE : constant := 8; -- floating point exception
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106 SIGKILL : constant := 9; -- kill (cannot be caught or ignored)
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107 SIGBUS : constant := 10; -- bus error
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108 SIGSEGV : constant := 11; -- segmentation violation
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109 SIGSYS : constant := 12; -- bad argument to system call
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110 SIGPIPE : constant := 13; -- write on a pipe with no one to read it
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111 SIGALRM : constant := 14; -- alarm clock
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112 SIGTERM : constant := 15; -- software termination signal from kill
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113 SIGURG : constant := 16; -- urgent condition on IO channel
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114 SIGSTOP : constant := 17; -- stop (cannot be caught or ignored)
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115 SIGTSTP : constant := 18; -- user stop requested from tty
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116 SIGCONT : constant := 19; -- stopped process has been continued
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117 SIGCLD : constant := 20; -- alias for SIGCHLD
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118 SIGCHLD : constant := 20; -- child status change
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119 SIGTTIN : constant := 21; -- background tty read attempted
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120 SIGTTOU : constant := 22; -- background tty write attempted
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121 SIGIO : constant := 23; -- I/O possible (Solaris SIGPOLL alias)
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122 SIGPOLL : constant := 23; -- pollable event occurred
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123 SIGTHREADKILL : constant := 24; -- Reserved by LynxOS runtime
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124 SIGXCPU : constant := 24; -- CPU time limit exceeded
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125 SIGXFSZ : constant := 25; -- filesize limit exceeded
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126 SIGVTALRM : constant := 26; -- virtual timer expired
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127 SIGPROF : constant := 27; -- profiling timer expired
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128 SIGWINCH : constant := 28; -- window size change
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129 SIGLOST : constant := 29; -- SUN 4.1 compatibility
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130 SIGUSR1 : constant := 30; -- user defined signal 1
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131 SIGUSR2 : constant := 31; -- user defined signal 2
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132
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133 SIGPRIO : constant := 32;
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134 -- Sent to a process with its priority or group is changed
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135
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136 SIGADAABORT : constant := SIGABRT;
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137 -- Change this if you want to use another signal for task abort. SIGTERM
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138 -- might be a good one.
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139
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140 type Signal_Set is array (Natural range <>) of Signal;
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141
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142 Unmasked : constant Signal_Set :=
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143 (SIGTRAP, SIGTTIN, SIGTTOU, SIGTSTP, SIGPROF, SIGTHREADKILL);
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144 Reserved : constant Signal_Set := (SIGABRT, SIGKILL, SIGSTOP, SIGPRIO);
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145
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146 type sigset_t is private;
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147
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148 function sigaddset (set : access sigset_t; sig : Signal) return int;
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149 pragma Import (C, sigaddset, "sigaddset");
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150
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151 function sigdelset (set : access sigset_t; sig : Signal) return int;
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152 pragma Import (C, sigdelset, "sigdelset");
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153
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154 function sigfillset (set : access sigset_t) return int;
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155 pragma Import (C, sigfillset, "sigfillset");
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156
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157 function sigismember (set : access sigset_t; sig : Signal) return int;
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158 pragma Import (C, sigismember, "sigismember");
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159
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160 function sigemptyset (set : access sigset_t) return int;
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161 pragma Import (C, sigemptyset, "sigemptyset");
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162
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163 type struct_sigaction is record
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164 sa_handler : System.Address;
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165 sa_mask : sigset_t;
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166 sa_flags : int;
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167 end record;
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168 pragma Convention (C, struct_sigaction);
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169 type struct_sigaction_ptr is access all struct_sigaction;
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170
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171 SA_SIGINFO : constant := 16#80#;
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172
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173 SA_ONSTACK : constant := 16#00#;
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174 -- SA_ONSTACK is not defined on LynxOS, but it is referred to in the POSIX
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175 -- implementation of System.Interrupt_Management. Therefore we define a
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176 -- dummy value of zero here so that setting this flag is a nop.
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177
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178 SIG_BLOCK : constant := 0;
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179 SIG_UNBLOCK : constant := 1;
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180 SIG_SETMASK : constant := 2;
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181
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182 SIG_DFL : constant := 0;
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183 SIG_IGN : constant := 1;
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184
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185 function sigaction
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186 (sig : Signal;
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187 act : struct_sigaction_ptr;
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188 oact : struct_sigaction_ptr) return int;
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189 pragma Import (C, sigaction, "sigaction");
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190
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191 ----------
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192 -- Time --
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193 ----------
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194
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195 Time_Slice_Supported : constant Boolean := True;
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196 -- Indicates whether time slicing is supported
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197
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198 type timespec is private;
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199
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200 type clockid_t is new int;
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201
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202 function clock_gettime
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203 (clock_id : clockid_t;
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204 tp : access timespec) return int;
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205 pragma Import (C, clock_gettime, "clock_gettime");
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206
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207 function clock_getres
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208 (clock_id : clockid_t;
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209 res : access timespec) return int;
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210 pragma Import (C, clock_getres, "clock_getres");
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211
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212 function To_Duration (TS : timespec) return Duration;
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213 pragma Inline (To_Duration);
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214
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215 function To_Timespec (D : Duration) return timespec;
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216 pragma Inline (To_Timespec);
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217
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218 type struct_timezone is record
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219 tz_minuteswest : int;
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220 tz_dsttime : int;
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221 end record;
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222 pragma Convention (C, struct_timezone);
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223 type struct_timezone_ptr is access all struct_timezone;
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224
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225 type struct_timeval is private;
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226
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227 -------------------------
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228 -- Priority Scheduling --
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229 -------------------------
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230
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231 SCHED_RR : constant := 16#100_000#;
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232 SCHED_FIFO : constant := 16#200_000#;
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233 SCHED_OTHER : constant := 16#400_000#;
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234
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235 function To_Target_Priority
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236 (Prio : System.Any_Priority) return Interfaces.C.int;
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237 -- Maps System.Any_Priority to a POSIX priority
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238
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239 -------------
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240 -- Process --
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241 -------------
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242
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243 type pid_t is private;
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244
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245 function kill (pid : pid_t; sig : Signal) return int;
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246 pragma Import (C, kill, "kill");
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247
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248 function getpid return pid_t;
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249 pragma Import (C, getpid, "getpid");
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250
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251 ---------
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252 -- LWP --
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253 ---------
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254
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255 type pthread_t is private;
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256
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257 function lwp_self return pthread_t;
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258 pragma Import (C, lwp_self, "pthread_self");
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259
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260 -------------
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261 -- Threads --
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262 -------------
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263
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264 type Thread_Body is access
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265 function (arg : System.Address) return System.Address;
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266 pragma Convention (C, Thread_Body);
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267
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268 function Thread_Body_Access is new
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269 Ada.Unchecked_Conversion (System.Address, Thread_Body);
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270
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271 subtype Thread_Id is pthread_t;
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272
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273 type pthread_mutex_t is limited private;
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274 type pthread_cond_t is limited private;
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275 type pthread_attr_t is limited private;
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276 type pthread_mutexattr_t is limited private;
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277 type pthread_condattr_t is limited private;
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278 type pthread_key_t is private;
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279
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280 PTHREAD_CREATE_DETACHED : constant := 1;
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281 PTHREAD_CREATE_JOINABLE : constant := 0;
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282
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283 PTHREAD_SCOPE_PROCESS : constant := 0; -- not supported by LynxOS178
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284 PTHREAD_SCOPE_SYSTEM : constant := 1;
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285
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286 -- Read/Write lock not supported on LynxOS. To add support both types
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287 -- pthread_rwlock_t and pthread_rwlockattr_t must properly be defined
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288 -- with the associated routines pthread_rwlock_[init/destroy] and
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289 -- pthread_rwlock_[rdlock/wrlock/unlock].
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290
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291 subtype pthread_rwlock_t is pthread_mutex_t;
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292 subtype pthread_rwlockattr_t is pthread_mutexattr_t;
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293
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294 -----------
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295 -- Stack --
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296 -----------
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297
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298 type stack_t is record
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299 ss_sp : System.Address;
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300 ss_flags : int;
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301 ss_size : size_t;
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302 end record;
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303 pragma Convention (C, stack_t);
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304
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305 function sigaltstack
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306 (ss : not null access stack_t;
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307 oss : access stack_t) return int;
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308 pragma Import (C, sigaltstack, "sigaltstack");
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309 -- Neither stack_t nor sigaltstack are available on LynxOS-178
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310
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311 Alternate_Stack : aliased System.Address;
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312 -- This is a dummy definition, never used (Alternate_Stack_Size is 0)
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313
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314 Alternate_Stack_Size : constant := 0;
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315 -- No alternate signal stack is used on this platform
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316
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317 Stack_Base_Available : constant Boolean := False;
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318 -- Indicates whether the stack base is available on this target
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319
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320 function Get_Stack_Base (thread : pthread_t) return Address;
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321 pragma Inline (Get_Stack_Base);
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322 -- Returns the stack base of the specified thread. Only call this function
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323 -- when Stack_Base_Available is True.
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324
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325 function Get_Page_Size return int;
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326 -- Returns the size of a page in bytes
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327
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328 PROT_NONE : constant := 1;
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329 PROT_READ : constant := 2;
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330 PROT_WRITE : constant := 4;
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331 PROT_EXEC : constant := 8;
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332 PROT_ALL : constant := PROT_READ + PROT_WRITE + PROT_EXEC;
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333
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334 PROT_ON : constant := PROT_READ;
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335 PROT_OFF : constant := PROT_ALL;
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336
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337 function mprotect (addr : Address; len : size_t; prot : int) return int;
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338 pragma Import (C, mprotect);
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339
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340 ---------------------------------------
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341 -- Nonstandard Thread Initialization --
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342 ---------------------------------------
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343
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344 procedure pthread_init;
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345 -- This is a dummy procedure to share some GNULLI files
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346
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347 -------------------------
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348 -- POSIX.1c Section 3 --
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349 -------------------------
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350 function sigwait
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351 (set : access sigset_t;
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352 sig : access Signal) return int;
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353 pragma Inline (sigwait);
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354 -- LynxOS has non standard sigwait
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355
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356 function pthread_kill
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357 (thread : pthread_t;
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358 sig : Signal) return int;
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359 pragma Import (C, pthread_kill, "pthread_kill");
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360
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361 function pthread_sigmask
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362 (how : int;
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363 set : access sigset_t;
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364 oset : access sigset_t) return int;
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365 pragma Import (C, pthread_sigmask, "pthread_sigmask");
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366
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367 ----------------------------
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368 -- POSIX.1c Section 11 --
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369 ----------------------------
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370
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371 function pthread_mutexattr_init
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372 (attr : access pthread_mutexattr_t) return int;
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373 pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
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374
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375 function pthread_mutexattr_destroy
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376 (attr : access pthread_mutexattr_t) return int;
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377 pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
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378
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379 function pthread_mutex_init
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380 (mutex : access pthread_mutex_t;
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381 attr : access pthread_mutexattr_t) return int;
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382 pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
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383
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384 function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
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385 pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
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386
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387 function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
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388 pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
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389
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390 function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
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391 pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
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392
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393 function pthread_condattr_init
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394 (attr : access pthread_condattr_t) return int;
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395 pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
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396
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397 function pthread_condattr_destroy
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398 (attr : access pthread_condattr_t) return int;
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399 pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
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400
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401 function pthread_cond_init
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402 (cond : access pthread_cond_t;
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403 attr : access pthread_condattr_t) return int;
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404 pragma Import (C, pthread_cond_init, "pthread_cond_init");
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405
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406 function pthread_cond_destroy (cond : access pthread_cond_t) return int;
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407 pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
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408
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409 function pthread_cond_signal (cond : access pthread_cond_t) return int;
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410 pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
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411
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412 function pthread_cond_wait
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413 (cond : access pthread_cond_t;
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414 mutex : access pthread_mutex_t) return int;
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415 pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
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416
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417 function pthread_cond_timedwait
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418 (cond : access pthread_cond_t;
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419 mutex : access pthread_mutex_t;
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420 abstime : access timespec) return int;
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421 pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
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422
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423 --------------------------
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424 -- POSIX.1c Section 13 --
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425 --------------------------
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426
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427 PTHREAD_PRIO_NONE : constant := 0;
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428 PTHREAD_PRIO_INHERIT : constant := 1;
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429 PTHREAD_PRIO_PROTECT : constant := 2;
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430
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431 function pthread_mutexattr_setprotocol
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432 (attr : access pthread_mutexattr_t;
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433 protocol : int) return int;
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434 pragma Import (C, pthread_mutexattr_setprotocol);
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435
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436 function pthread_mutexattr_setprioceiling
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437 (attr : access pthread_mutexattr_t;
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438 prioceiling : int) return int;
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439 pragma Import (C, pthread_mutexattr_setprioceiling);
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440
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441 type struct_sched_param is record
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442 sched_priority : int;
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443 end record;
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444 pragma Convention (C, struct_sched_param);
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445
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446 function pthread_setschedparam
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447 (thread : pthread_t;
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448 policy : int;
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449 param : access struct_sched_param) return int;
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450 pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
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451
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452 function pthread_attr_setscope
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131
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453 (Unused_attr : access pthread_attr_t;
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454 Unused_contentionscope : int) return int is (0);
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111
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455 -- pthread_attr_setscope is not implemented in production mode
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456
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457 function pthread_attr_setinheritsched
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458 (attr : access pthread_attr_t;
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459 inheritsched : int) return int;
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460 pragma Import (C, pthread_attr_setinheritsched);
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461
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462 function pthread_attr_setschedpolicy
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463 (attr : access pthread_attr_t;
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464 policy : int) return int;
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465 pragma Import (C, pthread_attr_setschedpolicy);
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466
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467 function sched_yield return int;
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468 pragma Import (C, sched_yield, "sched_yield");
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469
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470 --------------------------
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471 -- P1003.1c Section 16 --
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472 --------------------------
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473
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474 function pthread_attr_init (attributes : access pthread_attr_t) return int;
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475 pragma Import (C, pthread_attr_init, "pthread_attr_init");
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476
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477 function pthread_attr_destroy
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478 (attributes : access pthread_attr_t) return int;
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479 pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
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480
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481 function pthread_attr_setdetachstate
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482 (attr : access pthread_attr_t;
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483 detachstate : int) return int;
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484 pragma Import (C, pthread_attr_setdetachstate);
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485
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486 function pthread_attr_setstacksize
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487 (attr : access pthread_attr_t;
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488 stacksize : size_t) return int;
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489 pragma Import (C, pthread_attr_setstacksize);
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490
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491 function pthread_create
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492 (thread : access pthread_t;
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493 attributes : access pthread_attr_t;
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494 start_routine : Thread_Body;
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495 arg : System.Address) return int;
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496 pragma Import (C, pthread_create, "pthread_create");
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497
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498 procedure pthread_exit (status : System.Address);
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499 pragma Import (C, pthread_exit, "pthread_exit");
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500
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501 function pthread_self return pthread_t;
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502 pragma Import (C, pthread_self, "pthread_self");
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503
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504 --------------------------
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505 -- POSIX.1c Section 17 --
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506 --------------------------
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507
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508 function pthread_setspecific
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509 (key : pthread_key_t;
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510 value : System.Address) return int;
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511 pragma Import (C, pthread_setspecific, "pthread_setspecific");
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512
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513 function pthread_getspecific
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514 (key : pthread_key_t) return System.Address;
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515 pragma Import (C, pthread_getspecific, "pthread_getspecific");
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516
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517 type destructor_pointer is access procedure (arg : System.Address);
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518 pragma Convention (C, destructor_pointer);
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519
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520 function pthread_key_create
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|
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521 (key : access pthread_key_t;
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522 destructor : destructor_pointer
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523 ) return int;
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524 pragma Import (C, pthread_key_create, "pthread_key_create");
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525
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|
526 ---------------------
|
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|
527 -- Multiprocessors --
|
|
|
528 ---------------------
|
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529
|
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|
530 function Current_CPU return Multiprocessors.CPU;
|
|
|
531 -- Return the id of the current CPU
|
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532
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|
533 function Get_Affinity (Id : Thread_Id) return Multiprocessors.CPU_Range;
|
|
|
534 -- Return CPU affinity of the given thread (maybe Not_A_Specific_CPU)
|
|
|
535
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|
536 function Get_CPU (Id : Thread_Id) return Multiprocessors.CPU;
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537 -- Return the CPU in charge of the given thread (always a valid CPU)
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538
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539 private
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540
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541 type sigset_t is array (1 .. 2) of long;
|
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542 pragma Convention (C, sigset_t);
|
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543
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544 type pid_t is new long;
|
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545
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546 type time_t is new int64;
|
|
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547
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|
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548 type suseconds_t is new int;
|
|
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549
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|
|
550 type timespec is record
|
|
|
551 tv_sec : time_t;
|
|
|
552 tv_nsec : long;
|
|
|
553 end record;
|
|
|
554 pragma Convention (C, timespec);
|
|
|
555
|
|
|
556 type struct_timeval is record
|
|
|
557 tv_sec : time_t;
|
|
|
558 tv_usec : suseconds_t;
|
|
|
559 end record;
|
|
|
560 pragma Convention (C, struct_timeval);
|
|
|
561
|
|
|
562 type st_attr is record
|
|
|
563 stksize : int;
|
|
|
564 prio : int;
|
|
|
565 inheritsched : int;
|
|
|
566 state : int;
|
|
|
567 sched : int;
|
|
|
568 detachstate : int;
|
|
|
569 guardsize : int;
|
|
|
570 end record;
|
|
|
571 pragma Convention (C, st_attr);
|
|
|
572 subtype st_attr_t is st_attr;
|
|
|
573
|
|
|
574 type pthread_attr_t is record
|
|
|
575 pthread_attr_magic : unsigned;
|
|
|
576 st : st_attr_t;
|
|
|
577 pthread_attr_scope : int;
|
|
|
578 end record;
|
|
|
579 pragma Convention (C, pthread_attr_t);
|
|
|
580
|
|
|
581 type pthread_condattr_t is record
|
|
|
582 cv_magic : unsigned;
|
|
|
583 cv_pshared : unsigned;
|
|
|
584 end record;
|
|
|
585 pragma Convention (C, pthread_condattr_t);
|
|
|
586
|
|
|
587 type pthread_mutexattr_t is record
|
|
|
588 m_flags : unsigned;
|
|
|
589 m_prio_c : int;
|
|
|
590 m_pshared : int;
|
|
|
591 end record;
|
|
|
592 pragma Convention (C, pthread_mutexattr_t);
|
|
|
593
|
|
|
594 type tid_t is new short;
|
|
|
595 type pthread_t is new tid_t;
|
|
|
596
|
|
|
597 type block_obj_t is record
|
|
|
598 b_head : int;
|
|
|
599 end record;
|
|
|
600 pragma Convention (C, block_obj_t);
|
|
|
601
|
|
|
602 type pthread_mutex_t is record
|
|
|
603 m_flags : unsigned;
|
|
|
604 m_owner : tid_t;
|
|
|
605 m_wait : block_obj_t;
|
|
|
606 m_prio_c : int;
|
|
|
607 m_oldprio : int;
|
|
|
608 m_count : int;
|
|
|
609 m_referenced : int;
|
|
|
610 end record;
|
|
|
611 pragma Convention (C, pthread_mutex_t);
|
|
|
612 type pthread_mutex_t_ptr is access all pthread_mutex_t;
|
|
|
613
|
|
|
614 type pthread_cond_t is record
|
|
|
615 cv_magic : unsigned;
|
|
|
616 cv_wait : block_obj_t;
|
|
|
617 cv_mutex : pthread_mutex_t_ptr;
|
|
|
618 cv_refcnt : int;
|
|
|
619 end record;
|
|
|
620 pragma Convention (C, pthread_cond_t);
|
|
|
621
|
|
|
622 type pthread_key_t is new int;
|
|
|
623
|
|
|
624 end System.OS_Interface;
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